Available-For-Sale Securities (Fair Values And Gross Unrealized Gains And Losses For The Securities Held) (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 1,594	$ 1,584
Gross Unrealized Gains	272	196
Gross Unrealized Losses	(9)	(26)
Fair Value	1,857	1,754
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member] \| Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	691	693
Gross Unrealized Gains	238	185
Gross Unrealized Losses	(7)	(13)
Fair Value	922	865
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member] \| Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	509	483
Gross Unrealized Gains	21	8
Gross Unrealized Losses	0	(3)
Fair Value	530	488
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member] \| Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	349	366
Gross Unrealized Gains	13	3
Gross Unrealized Losses	(2)	(10)
Fair Value	360	359
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member] \| Total Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	858	849
Gross Unrealized Gains	34	11
Gross Unrealized Losses	(2)	(13)
Fair Value	890	847
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member] \| Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	45	42
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	45	42
Rabbi Trust [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	207	204
Gross Unrealized Gains	17	11
Gross Unrealized Losses	0	(2)
Fair Value	224	213
Rabbi Trust [Member] \| Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	11	12
Gross Unrealized Gains	11	10
Gross Unrealized Losses	0	0
Fair Value	22	22
Rabbi Trust [Member] \| Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	104	108
Gross Unrealized Gains	3	1
Gross Unrealized Losses	0	(1)
Fair Value	107	108
Rabbi Trust [Member] \| Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	91	82
Gross Unrealized Gains	3	0
Gross Unrealized Losses	0	(1)
Fair Value	94	81
Rabbi Trust [Member] \| Total Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	195	190
Gross Unrealized Gains	6	1
Gross Unrealized Losses	0	(2)
Fair Value	201	189
Rabbi Trust [Member] \| Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	1	2
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	1	2
Rabbi Trust [Member] \| Power [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	$ 55	$ 52

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Paragraph 2
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
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